Effect of the Crosslinking Degress of Gels from Vinyl Copolymers on the Stimuliresponsive Properties

김대섭,김형근,김준호 한국고분자학회 2009 한국고분자학회 학술대회 연구논문 초록집 Vol.2009 No.4

上口脣에 原發한 扁平上皮細胞癌 除去後의 再建術 1例

柳在萬,金箕洪,高一煥,金春元,金大燮 大韓成形外科學會 1974 Archives of Plastic Surgery Vol.1 No.1

A 58 years old housewife was admitted in our medical center because of squamous cell carcinoma of the lower lip. The duration is 4 years. The patient has not history of smoking and exposing in the sun in her daily life. The lesion on left lower lip is un indurated ulceration measuring 2.0cm×2.0cm in size, and also easily bleed on touch. On physical examination, there was no palpable regional lymphnode in the neck but the biopsy on the lesion showed well differentiated squamous cell carcinoma. There is many way to treat the squamous cell carcinoma of the lower lip and reconstruction of the defect after wide resection. On this patient wide V-shape excision was carried out and defect was reconstructed by the was of Camille Bernard operation with Martin's modification. The lymphnode dissection in the neck was not carried out because of there is not only palpable regional lymphnode but the pathological diagnosis was well differentiated type. There were no functional disturbance of the mouth and also deformity was minimal.

Preparation and Characterization of Smart Hydrogel Webs by Electrospinning

김대섭,김형근,김준호 한국고분자학회 2009 한국고분자학회 학술대회 연구논문 초록집 Vol.2009 No.10

방사선 종양 자료관리 시스템 구축

김대섭,이창주,유순미,김종민,이우석,강태영,백금문,홍동기,권경태,Kim, Dae-Sup,Lee, Chang-Ju,Yoo, Soon-Mi,Kim, Jong-Min,Lee, Woo-Seok,Kang, Tae-Young,Back, Geum-Mun,Hong, Dong-Ki,Kwon, Kyung-Tae 대한방사선치료학회 2008 대한방사선치료학회지 Vol.20 No.2

Purpose: To enlarge the efficiency of operation and establish a constituency for development of new radiotherapy treatment through database which is established by arranging and indexing radiotherapy related affairs in well organized manner to have easy access by the user. Materials and Methods: In this study, Access program provided by Microsoft (MS Office Access) was used to operate the data base. The data of radiation oncology was distinguished by a business logs and maintenance expenditure in addition to stock management of accessories with respect to affairs and machinery management. Data for education and research was distinguished by education material for department duties, user manual and related thesis depending upon its property. Registration of data was designed to have input form according to its subject and the information of data was designed to be inspected by making a report. Number of machine failure in addition to its respective repairing hours from machine maintenance expenditure in a period of January 2008 to April 2009 was analyzed with the result of initial system usage and one year after the usage. Results: Radiation oncology database system was accomplished by distinguishing work related and research related criteria. The data are arranged and collected according to its subjects and classes, and can be accessed by searching the required data through referring the descriptions from each criteria. 32.3% of total average time was reduced on analyzing repairing hours by acquiring number of machine failure in addition to its type in a period of January 2008 to April 2009 through machine maintenance expenditure. Conclusion: On distinguishing and indexing present and past data upon its subjective criteria through the database system for radiation oncology, the use of information can be easily accessed to enlarge the efficiency of operation, and in further, can be a constituency for improvement of work process by acquiring various information required for new radiotherapy treatment in real time.

Cefradine 함유 alginate bead의 제조 및 용출

김대섭,구자성,양재헌 우석대학교 생명과학연구소 1998 생명과학연구소 논문집 Vol.2 No.-

Cefradine, first generation cephalosporins, is a water soluble antibiotic agent. We prepared the alginate beads containing cefradine for developing release and evaluated the dissolutions of cefradine from beads. Cefradine was encapsulated into inner water phase of W/O/W emulsion beads which were prepared by cross-linking of alginate with Ca^2+. The delayed release patterns of cefradine for W/O/W emulsion beads were observed as it was compared with alginate simple beads without oil phase. As a results, W/O/W multiple emulsion beads could be use a controlled release DDS of water soluble agents such as cefradine. Also chitosan of high M.W could be a good intermediator of controlled release DDS.

방사선치료 장치 및 관련시설에서의 산란 중성자에 관한 연구

김대섭,김정만,이희석,임라승,김유현,Kim Dae-Sup,Kim Jeong-Man,Lee Hee-Seok,Lim Ra-Seung,Kim You-Hyun 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.2

Purpose : It is known that the neutron is generally generated from the photon, its energy is larger than 10 MV. The neutron is leaked in the container inspection system installed at the customs though its energy is below 9 MV. It is needed that the spacial effect of the neutrons released from radiation treatment machine, linac, installed in the medical canter. Materials and Methods : The medical linear accelerator(Clinac 1800, varian, USA) was used in the experiment. Measuring neutron was used bubble detector(Bubble detector, BDPND type, BTI, Canada) which was created bubble by neutron. The bubble detector is located on the medical linear accelerator outskirt in three different distance, 30, 50, 120 cm and upper, lower four point from the iso-center. In addition, for effect on protect material we have measured eight points which are 50 cm distance from iso-center. The SAD(source-axis-distance), distance from photon source to iso-center, is adjusted to 100 cm and the field size is adjusted to $15{\times}15cm^2$. Irradiate 20 MU and calculate the dose rate in mrem/MU by measuring the number of bubble. Results : The neutron is more detected at 5 position in 30, 50 cm, 7 position in 120 cm and with wedge, and 2 position without mount. Conclusion : Though detection position is laid in the same distance in neutron measurement, the different value is shown in measuring results. Also, neutron dose is affected by the additional structure, the different value is obtained in each measurement positions. So, it is needed to measure and evaluate the neutron dose in the whole space considering the effect of the distance, angular distribution and additional structure.

폴리비닐알콜/폴리아크릴로니트릴 블렌드 필름의 제조 및 특성

김대섭,홍유경,김준호,Kim, Dae-Sup,Hong, Yu-Kyoung,Kim, Joon-Ho 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.1

A poly(vinyl alcohol)(PVA)/poly(acrylonitrile)(PAN) blend film was prepared and its properties were characterized to investigate the possibility of improving PVA as a reinforcing materials. From the wide-angle X-ray diffraction patterns of the blend films it can be seen that the diffraction peaks from each polymer's crystal were not changed by blending, this implies there is no mutual influence in crystallization. The water contact angle of the blend film increased with increasing PAN content. The decrease rate of the water contact angle of the blend film with time was smaller than the rate for pure PVA film. The melting temperatures of the PVA/PAN blend film only at the ratios of 99/1 and 97/3 were higher than that of pure PVA film. The thermal decomposition temperature and residual weight of the blend films were increased with increasing PAN content, indicating improved thermal stability after blending with PAN. The tensile strength and Young's modulus of the film increased after blending and the PVA/PAN blend film containing 3wt% of PAN showed the best mechanical properties.

향상된 동적쐐기인자(Enhanced Dynamic Wedge Factor)의 특성 및 적용에 관한 고찰

김대섭,반태준,염미숙,유순미,이우석,백금문,권경태,Kim, Dae-Sup,Ban, Tae-Joon,Yeom, Mi-Suk,Yoo, Soon-Mi,Lee, Woo-Seok,Back, Geum-Mun,Kwon, Kyung-Tae 대한방사선치료학회 2010 대한방사선치료학회지 Vol.22 No.1

Purpose: We try to calculate EDW-factor easily with the formula applies essential data of EDW-factor and evaluate the validity through a measurement. Materials and Methods: We used the given value of GSTT (Golden Segmented Treatment Table) for the calculation of the EDW-factor. As to the experimental device, 0.6 cc farmer-type ion-chamber, an electrometer and water- phantom were used. A measurement was made at the maximum dose depth of the photon beam energy 6 MV and 15 MV under the condition that SSD (Source to Surface Distance) was 100 cm. The angle of the EDW (Enhanced Dynamic Wedge) which we use in an experiment was 60 degree, 30 degree, 20 degree in the Y1-OUT direction. We used Eclipse planning system (Varian, USA) as RTP system and the EDW-factor was calculated about all fields and EDW direction. In order to show the EDW-factor feature, a measurement was made at the selected field that verify the influence of the dependability about X, Y jaw and off-axis field. Results: When we change the Y1 field, it influence on the EDW-Factor and measured value. But the error between measured values and calculated values was less than 1%. The experimental result indicated the tendency that the error of the result of calculation and measured value becomes smaller as the EDW angle become smaller whether the calculation point (measurement point) and iso-center are same or not. The influence of the field size and energy did not show up. We simulated with the same condition using the RTP system. And we found that it makes no difference between the MU which is calculated manually by applying the EDW-Factor obtained from the commercial program and the value which is calculated by using RTP system. Conclusion: We excluded fitting value from well-known EDW-Factor formula and calculated EDW-factor with the formula applies essential data of EDW-factor only. As a result, there are no significant difference between the measured value and calculated value and it showed errors less than 1%. Also, we implemented the commercial program to calculate EDW-Factor conveniently without measure a factor on each field.

Carbon-coated SiOx anode materials via PVD and pyrolyzed fuel oil to achieve lithium-ion batteries with high cycling stability

김대섭,김경훈,Lim Chaehun,이영석 한국탄소학회 2022 Carbon Letters Vol.32 No.1

Silicon oxide (SiOx) has been considered one of the most promising anode materials for lithium-ion batteries due to having a higher capacity than the commercial graphite anodes. However, its practical application is hampered by very large volume variations. In this work, pyrolysis fuel oil is the carbon coating precursor, and physical vapor deposition (PVD) is performed on SiOx at 200 and 400 °C (SiOx@C 200 and SiOx@C 400), followed by carbonization at 950 °C. SiOx@C 200 has a carbon coating layer with a thickness of ~ 20 nm and an amorphous structure, while that of SiOx@C 400 is approximately 10 nm thick and has a more semigraphitic structure. The carbon-coated SiOx anodes display better charge–discharge performance than the pristine SiOx anode. In particular, SiOx@C 200 shows the highest reversible capacity compared with the other samples at high C-rates (2.0 and 5.0 C). Moreover, SiOx@C 200 exhibits excellent cycling stability with a capacity retention of 90.2% after 80 cycles at 1.0 C. This result is ascribed to the suppressed volume expansion by the PFO carbon coating on SiOx after PVD.

Amorphous carbon coating of SiOx through PFO for anode of lithium ion batteries

김대섭,임채훈,이란은,이혜련,김석진,이영석 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.1